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| Re: (interlocking) TA is obsessed with CBTC, and ''New'' tech for no reason. (580958) | |||
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Re: (interlocking) TA is obsessed with CBTC, and ''New'' tech for no reason. |
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Posted by randyo on Wed Mar 5 05:09:19 2008, in response to Re: (interlocking) TA is obsessed with CBTC, and ''New'' tech for no reason., posted by Jeff H. on Wed Mar 5 00:20:54 2008. Not on the unmodified model 2s. The emergency switch release on most model 2s was merely a push button identical to the call on button. The switch release button was sealed like the screw release button on the model 5s and modified model 2s. All the Tw/M on a model 2 would have to do is break the seal (with appropriate authorization of course) and push the button. The switch detctor light would illuminate and while hoding the button in, the Tw/M could move the lever to the desired position. The unmodified model 2s also lacked call on buttons on the front of the machine but instead had a trigger operated lever on the back of the interlocking machine immediately behind the associated signal lever. When the trigger was pulled, the lever would extend out from the back of the machine about 6 inches and a call on signal would be displayed. There were intermediate modifications made to some of the model 2s where the call on signal was activated by a button on the front like on a model 5 but which retained the push button switch release. The final modification to the model 2s included an emergency screw release identical to those on the model 5s which required the insertion of a crank handle which was usually found in a designated place in the back of the machine. The specfic machines of this type which I operated were at Pacific St, 36 St, and Bedford Av on the 14 St Line. There may have been others but these were the only ones I was personally aware of. Another unique feature of all the BMT interlockings including those with model 5s was that unlike the IND interlockings, a train was not required to be on the approach circuit in order for a call on aspect to be displayed. In fact on the original unmodified model 2s with the call on levers on the back, operation of the call on lever with the associated signal lever in the clear position would cause the signal to drop to a call on aspect without having to first return the signal lever to the normal position. |
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